Car-roof.



W. D. THOMPSON & D. W1HAWKSWORTH.

, CAR ROOF. APPLICATION FILED JUNE 11. 1910.

Patented Sept. 19, 1916.

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WILLIAM D. THOK PSON AND DAVID W. HAWKSWORTI-I, OF DETROIT, MICHIGAN; ASSIGNORS TO HUTCHIN S CAR ROOFING COMPANY, OF DETROIT, MICHIGAN, A

CORPORATION OF MICHIGAN.

can-Roar.

Patented Sept. 19, 1916.

Application filed June 11, 1910. Serial No. 566,385.

To all whom it may concern:

Be it known that we, \VILLIAM D. THOMP- SON and DAVID W. HAWKSWORTH, citizens of the United States of America, residing at Detroit, in the 0ounty of Wayne and State of Michigan, hate invented certain new and useful Improvements in Car-Roofs, of which the following. is a specification, reference being had therein to the accompanying drawings.

It is the object of the invention to obtain a construction of car roof, 1n which the. maximum of strength is combined with a minimum of weight and at the same t1me, one in which the depth or thickness of the roof structure is reduced to the minimum.

With these objects in view the invention consists in a construction as hereinafter set forth.

In the drawings: Figure 1 is a cross section through the roof on one side of the ridge. Fig. 2 is a-longitudinal sectlon on line w-a; Fig. 1. Fig. 3 is a sectlon onjllne Fi .1. d ii the construction of ear roofs it is usual to provide carlines which form the roof truses and purlins extending. longitudinally of the structure. The carlines sustain the roof load which is the principal stress to which they are subjected.

As it is one of the objects of our invention to reduce the depth of the roof while maintaining its strength, we have selected for the carlines, a. form of beam possessing the greatest strength in proportion to its height, viz.: an I-beam. This beam A is bent at the center which is arranged above the ridge purlin B and at the eaves is secured to the plates C on opposite sides of the car. The

attachment between the beam and the plates may be formed by cutting away the upper flange and web of the beam and bending the lower flange to over-lap the side of the plate. At the ridge the beam is secured by a clip preferably a 'U bolt E which embraces the beam, and passes downward through the ridge purlin.

F are the intermediate purlins which extend longitudinally of the roof and are prefe'rably notched or gained at G to receive the base flange of the car-lines. To avoid diminishingthe strength of beam by cutting the. flanges thereof, the purlins are clipped to the beams and as shown, these clips are in the form'of straps H which pass throughslots I inthe web of the beam, these being located near the neutral axis where the removal of metal will not diminish the strength.

The roof frame just described, is one possessing great strength, while the maxi-' mum thickness is the depth of the beam plus the slight thickness of the purlins. .To com plots the roof the metallic span plates J are arranged to extend between the beams, bemg supported upon the upper feces of the purlins. The plates J are provided at op- At the ridge the plates J are provided with upturned flanges M which are embraced by a ridge cap N and these ridge caps are secured by junction caps 0 arranged above the cal-lines and embracing both the 'carlinc caps and ridge caps. The caps 0 may be secured by upwardly extending studs 1 which as shown are integral with the U bolts E- and are arranged at the center thereof. These studs may also be used for 1 securing the saddles Q for the running board. The plates J are secured at theeaves by depending flanges R nailed or otherwise secured to'the plate 0. i i saw...

It will be observedthatthe entire thickness of the roof structure is confined approximately within'the spacelimits of the car-lines and on account of the shape of the beam. employed, the height may be reduced to a greater extent than is possible with any other structure. served that the roof sheets J do not rest It will also be ob upon the metallic flanges of the beams butare, supported solely by the purlins, which latter are sustained by their connections with the carlines. This diminishes wear as the purlins are. formed of we d and will not abrade the surface of the pie es in contact therewith. Y

What we claim as our invention is:

1. In a car roof, the combination with carlines and purlins, of relatively-movable loadsupporting roofing sheets extending over a portion of said carlines and having flanged edges, said sheets being supported by sald purlins out of contact with said oarlines, and said flanged edges forming a truss for sustaining the sheet intermediate the pur lins.

2. In a car roof, the combination with a car-line having ahase flange, of a purlin gained to receive said base flange so that the upper edge of said flange is positioned below the plane of the upper face of the pu1'1in, and a relatively-movable meta-Hi0 load-sustaining roofing sheet "having a flanged edge portion'extending over said 5 In testimony whereof we afiix our signa- 20 tnres in presence of two Witnesses. v 4 WILLIAM D. THOMPSON.- DAVID W. HAWKSWORTH. Witnesses:

W. J. BELKNAP, JAMES P. BARRY. 

